Answer:a.produces zygote
Explanation: reproduction is tge process where organisms both plant and animals produce similar organisms to their,in order to continue their existence.reproduction could be internal or external.the male organism may directly deposit sperm into the female reproductive tract to fertilize the egg or it may fertilize the egg outside of the female.in both cases,a zygote is formed From the fusion of both male and female gamete.this zygote undergoes several mitotic Division to become a matured organism.
External fertilization occurs in fishes and Amphibians eg frogs. and internal reproduction occurs in mammals and birds